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mole
6.02 x 10^23 representative particles of a substance and the SI unit for measuring the amount of a substance
Avogadro's number
the number of representative particles in a mole, 6.02 x 10^23
representative particle
the species present in a substance (usually atoms, molecules, or formula units)
molar mass
the mass of a mole of an element
Avogadro's hypothesis
equal volumes of gases at the same temperature and pressure contain equal numbers of particles
Standard temperature and pressure (STP)
a temperature of 0 degrees C and a pressure of 101.3 kPa, or 1 atmosphere (atm)
molar volume
the quantity, 22.4 L of a gas
percent composition
expresses the relative amounts of the elements in a compound with the percent by mass of each element in the compound
empirical formula
the basic ratio, which gives the lowest whole-number ratio of the atoms of the elements in a compound
Note
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